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Cyber-attacks on critical infrastructure have been a growing concern to government and military organizations. This paper aims to study the impact of cyber-attacks on a SCADA system. To perform this research, a cyber-physical testbed emulating power generation station is designed. It contains power generation units, real-time programmable logic controllers, drives, HMI and supervisory computers. The testbed implements the process monitoring/data collection, typical for an industrial power facility. This data facilitates the deployment and analysis of several approaches for exposing different attack types and the likely impact of cyber attacks on the testbed.